> I always thought of that as “yak-shaving,” or “bikeshedding.”

I think of yak-shaving as ending up (by lack of discipline, or perhaps out of necessity) working on some supporting aspect of a supporting aspect of a supporting aspect... in service of the original task.

So, a potential time suck, for sure, but "perfection is the enemy of completion" doesn't have to be that deep - if we're throwing out more clever phrases and war stories - another phrase that comes to mind about just "polishing" and insisting it's not good enough to ship yet is it's (slightly NSFW)

"just like masturbation - it feels good, but you're only f*cking yourself". You need to ship.

Bike Shedding I think of as social - nearly Peter Principle in practice - everybody thinks they've got something to contribute to the construction of the bike shed because it's a thing that's easy to manage, and people want to be helpful and/or make a mark.